/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.consensus.ratis;

import org.apache.iotdb.consensus.common.request.IConsensusRequest;
import org.apache.ratis.protocol.Message;
import org.apache.ratis.thirdparty.com.google.protobuf.ByteString;
import org.apache.ratis.thirdparty.com.google.protobuf.UnsafeByteOperations;

public class RequestMessage implements Message {

    private final IConsensusRequest actualRequest;
    private volatile ByteString serializedContent;

    public RequestMessage(IConsensusRequest request) {
        this.actualRequest = request;
        serializedContent = null;
    }

    public IConsensusRequest getActualRequest() {
        return actualRequest;
    }

    @Override
    public ByteString getContent() {
        if (serializedContent == null) {
            synchronized (this) {
                if (serializedContent == null) {
                    serializedContent =
                            UnsafeByteOperations.unsafeWrap(actualRequest.serializeToByteBuffer());
                }
            }
        }
        return serializedContent;
    }
}
